Astronomy:21 Camelopardalis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 05h 40m 28.99683s[1] |
| Declination | +61° 56′ 56.0999″[1] |
| Apparent magnitude (V) | 6.867[2] |
| Characteristics | |
| Spectral type | A5[3] |
| B−V color index | +0.22[4] |
| Astrometry | |
| Radial velocity (Rv) | −15.5[5] km/s |
| Proper motion (μ) | RA: −6.911[1] mas/yr Dec.: +1.818[1] mas/yr |
| Parallax (π) | 5.0131 ± 0.0864[1] mas |
| Distance | 650 ± 10 ly (199 ± 3 pc) |
| Absolute magnitude (MV) | 0.90[6] |
| Details | |
| Radius | 3.121[7] R☉ |
| Luminosity | 35.66[6] L☉ |
| Temperature | 7,619[7] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
21 Camelopardalis is a star in the northern circumpolar constellation of Camelopardalis, located around 650 light years away from the Sun.[1] It is a challenge to view with the naked eye even under excellent viewing conditions, having an apparent visual magnitude of 6.9.[2] This is one of the fainter stars with a Flamsteed designation, one of only 220 below the magnitude cutoff for the Bright Star Catalogue.[9] It is moving closer to the Earth with a heliocentric radial velocity of −15.5 km/s.[5]
The spectral type for 21 Camelopardalis is given only as A5 with no published luminosity class. It is treated as a normal main sequence star,[10] although it is calculated to be larger and more luminous than a typical A5 main sequence star.[7][11] Based upon changes to its proper motion over time, this is a probable astrometric binary.[12]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 Paunzen, E. (2015). "A new catalogue of Strömgren-Crawford uvbyβ photometry". Astronomy & Astrophysics 580: A23. doi:10.1051/0004-6361/201526413. Bibcode: 2015A&A...580A..23P.
- ↑ Eggen, O. J. (1985). "Hyades and Sirius supercluster members brighter than magnitude(V) 7.1. I - the first six hours of right ascension". Astronomical Society of the Pacific 97: 807. doi:10.1086/131607. Bibcode: 1985PASP...97..807E.
- ↑ Soubiran, C.; Le Campion, J.-F.; Cayrel De Strobel, G.; Caillo, A. (2010). "The PASTEL catalogue of stellar parameters". Astronomy and Astrophysics 515: A111. doi:10.1051/0004-6361/201014247. Bibcode: 2010A&A...515A.111S.
- ↑ 5.0 5.1 Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode: 1953GCRV..C......0W.
- ↑ 6.0 6.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 7.2 Masana, E.; Jordi, C.; Ribas, I. (2006). "Effective temperature scale and bolometric corrections from 2MASS photometry". Astronomy and Astrophysics 450 (2): 735. doi:10.1051/0004-6361:20054021. Bibcode: 2006A&A...450..735M.
- ↑ "21 Cam". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=21+Cam.
- ↑ Bidelman, W. P. (1990). "Flamsteed stars not contained in the Yale "Catalogue of Bright Stars"". Bulletin d'Information du Centre de Données Stellaires 38: 13. Bibcode: 1990BICDS..38...13B.
- ↑ Jordi, C.; Figueras, F.; Torra, J.; Asiain, R. (1996). "UvbyHbeta_ photometry of main sequence A type stars". Astronomy and Astrophysics Supplement 115: 401. Bibcode: 1996A&AS..115..401J.
- ↑ Habets, G. M. H. J.; Heintze, J. R. W. (1981). "Empirical bolometric corrections for the main-sequence". Astronomy and Astrophysics Supplement Series 46: 193. Bibcode: 1981A&AS...46..193H.
- ↑ Frankowski, A.; Jancart, S.; Jorissen, A. (March 2007), "Proper-motion binaries in the Hipparcos catalogue. Comparison with radial velocity data", Astronomy and Astrophysics 464 (1): 377–392, doi:10.1051/0004-6361:20065526, Bibcode: 2007A&A...464..377F
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